191019806396 has 48 divisors (see below), whose sum is σ = 341150164992. Its totient is φ = 93561988800.

The previous prime is 191019806387. The next prime is 191019806431. The reversal of 191019806396 is 693608910191.

It is a happy number.

It is a super-3 number, since 3×191019806396³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73723061 + ... + 73725651.

It is an arithmetic number, because the mean of its divisors is an integer number (7107295104).

Almost surely, 2^191019806396 is an apocalyptic number.

It is an amenable number.

191019806396 is a deficient number, since it is larger than the sum of its proper divisors (150130358596).

191019806396 is a wasteful number, since it uses less digits than its factorization.

191019806396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770 (or 3768 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 53.

The spelling of 191019806396 in words is "one hundred ninety-one billion, nineteen million, eight hundred six thousand, three hundred ninety-six".